Interrupter gear housing



May 17, 1932 i MARTlN 1,858,675

v INTERRUPTER GEAR HOUSING Filed Dec. 2, 1930 lill INVENTQR 756/; I? M r-7W9 ATTORNEY Patented May 17, 1932 UNITED STATES PATENT OFFICE JOHN FREDERICK MARTIN, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO AMERIGAN BOSCH MAGNETO CORPORATION, OI SPRINGFIELD, MASSACHUSETTS, A

CORPORATION OF NEW YORK INTERRUPT'ER Application filed December The invention herein relates to improvements in the construction of electric magnetos, such as are used for ignition work in connection with internal combustion engines.

An object of the invention is to provide a magneto of this type with an improved plate to close one entire end of the magneto and at the same time support the housing for the interrupter. Another object of the invention is to provide a cover shaped to be fitted to one end of the magneto and to serve as a closure for both the armature chamber and the distributor gear housing, and at the same time to mount a housing for the interrupter or circuit breaker, with cams inside to operate the latter.

Additional objects and advantages of the invention will appear as the description proceeds; and I of course reserve the right to make changes in the shape, size and arrangement of the various parts, to the full extent indicated by the meanings of the broad terms in which the appended claim is expressed.

On the drawings:

Figure 1 is a longitudinal sectional view of one end of a magneto with my improved cover plate attached;

Figure 2 is an inside view of said plate;

Figure 3 is an outside view of the same, and

Fig. 4 shows a side elevation of the exterior of the magneto with the improved cover plate attached.

On the drawings the same numerals identify the same parts throughout.

The magneto, illustrated in part on F igure 1, comprises a frame-work 1 bearing the usual pole pieces and supporting one or more magnets, a fragment of which is indicated at 2. The lower part of the framework contains a chamber extending from one end to the other to receive the rotatable armature 3; and at its rear end, which is shown in Figure 1, the upper part of the frame-work will be shaped to provide a housing 4 to enclose the gear which operates the distributor mechanism of the magneto. The cover plate for this end of the magneto is shown at 5; and it extends from the bottom of the frame-work to the top of the gear housing 4. The dis- GEAR HOUSING 2, 1930. Serial No. 499,426.

tributor mechanism 36 will be suitably mounted at the front end of the magneto, as indicated in Fig. 4; and at the same end the armature 3 will have a trunnion or drive shaft 37 which is supported in a ball-bearing similar to the ball-bearing shown at 6 at the opposite or rear end of the magneto, which is presented in Figure l; the drive shaft at the front end projecting out of the framework to enable the magneto to be coupled to a suitable drive shaft. At the rear end the armature 3 has another trunnion or journal 7, which is hollow and turns in the bearing 6; and carries on its outer end the circuit breaker or interrupter mechanism 8. This circuit breaker may be of any suitable construction and usually comprises a rotatable disk bearing a fixed contact and a movable contact to which the circuit of the armature is connected and therefore need not be further described here. The gear housing contains a bearing 9 above the armature 3 and in this bearing is the distributor shaft 10 which is rotated by the gear 11. This gear 11 meshes with a gear 12 on the adjacent end of the armature beneath it. The gear housing 4 may contain suitable inside spaces and ducts leading thereto for the admission of lubricant to the shaft 10 but these ducts and spaces form no part of this invention. On the interior face of the cover 5 is a central boss 13, having a recess 14 to receive a flanged plug 15, which abuts the end of spring pressed contact brush 16 in the end of the shaft 10. The brush is disposed within a suitable bore 17 and the spring between the bottom of this bore and the brush 16 will act to prevent any play of the shaft 10 when in rotation.

The cover plate 5. as above stated. closes not only the gear housing 4 but also the rear end of the armature chamber below it. In its upper half it is dished or concave on its inner face, as shown at 18 and it has a rim 19 which abuts the rim of the gear housing 4 and likewise it engages the lower part of the frame-work 1 around the end of the chamber for the armature 3. The lower part of the inner face of this end plate is bored out at 20 to receive the raceway members of the ball-bearing 6 and is perforated at 21 to permit the trunnion 7 to pass therethrough. Between the aperture 21 and the counterbore there may be a shoulder 22 for a suitable washer to surround the trunnion 7 Concentric with the opening 21 is the circuit breaker casing or housing 23, the plate 5 and casing 23 being all in one piece. The casing 23 may be closed by lid 24 secured by catch 25 rotatably mounted on a stud 26. This cap may be of insulation and on its outside it may have a conducting piece 27 bent into proximity with the casing 23. The interrupter mechanism 8 is mounted upon a metal disk 28 attached to the end of the trunnion 7 and through this trunnion and disk passes the usual conductor rod 29 which con.- nects one terminal of the interrupter to the armature winding; the other being grounded. A brush 30 on the inside of the cap 2 1 in circuit with the piece 27 may contact with the outer end of the rod 29, in the well-known manner.

Within the casing 23 and at diametrically opposite points are cam projections 31 to operate the circuit breaker. These cam projections may be cast integral with the casing 23 or they may be carried by a separate ring in said casing. The plate 5 and casing 23 being immovable, this cover with the timer casing made integral with same is suitable only for magnetos with fixed ignition; that is to say, requiring no adjustment of the spark. The plate is provided with apertures 32 so that it can be secured to the adjacent end of the frame-work 1 by suitable screws, one of which may be the post 26 below the casin 23. Around the adjacent end of the chamber for the armature 3 may be a counter-bored shoulder 33 which receives a projecting rim 34 on the lower part of the plate 5; and two of the openings for the fastening screws may be disposed in internal projections 35 at either side in the rim 19, about at the top of the armature chamber. Between these internal projections 35 the plate 5 is dished enough to enable the engaging portions of gears 11 and 12 to have the necessary clearance.

By this invention a single part is provided for closing the entire'rear end of the magneto; affording in one piece a cover for the gear housing and an end plate to fit over the extremity of the armature and chamber containing same, and an interrupter casing containing operating cams.

Having thus described my invention, what I claim is: V

A magneto comprising a framework designed to mount distributor mechanism at one end thereof, said framework having a gear housing at the'opposite end and an armature chamber therein below the gear housing, a cover plate for the gear housing and one end of the chamber, said cover plate being of substantially the same height as the framework and having a rim on its interior face to engage the rim of the gear housing and being concave on said face, said rim also having an annular projection at the lower part and the framework having a shoulder at the end of the armature chamber to receive said projection, the rim also having opposed projections at its sides-adj acent the top of the armature chamber, a distributor gear on the armature, said gears meshing with each other between said opposed projections, and an integral timer casing in line with the armature chamber on the outer face of the plate, said casing having one or more operating cams therein.

In testimony whereof I afiix my signature.

JOHN FREDERICK MARTIN. 

